Forging-press.



P. 1. ELLIS & 5,1. MQILVRIED.

FORGING PRESS.

APPLICATION FILED 11.27, 19 10. 1,002,571. Patented Sept. 5,1911.

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Wl TNES SES D INVENTORg COLUMBIA PLANOGRAPH 110., WASHINGTON, D. C.

F. I. E LLIS & E. J. MOILVRIBD- FORGING PRESS. APPLICATION FILED APR. 27, 1910.

1,002,571, Patented Sept. 5, 1911.

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F I. ELLIS & B. J. MOILVRIED.

PORGING PRESS. APPLIOATION FILED APR. 27, 1910.

Patented Sept. 5,1911.

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WITNESSES COLUIIIA MIA"! CO WAIQIIW, D. 6.

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FRANK I. ELLIS AND EDWIN J. MGILVRIED, 0F PITTSBURG, PENNSYLVANIA, ASSIGN- ORS TO UNITED ENGINEERING & FOUNDRY COMPANY, OF PITTSBURG, PENNSYL- VANIA, A CORPORATION OF PENNSYLVANIA.

FORGING-PRESS.

Specification of Letters Patent.

Patented Sept. 5, 1911.

Application filed. April 27, 1910. Serial No. 557,973.

To all whom it may concern:

Be it known that we, FRANK I. ELLIs and EDWIN J. MoILvRIED, residents of Pittsburg, Allegheny county, Pennsylvania, have invented a new and useful Improvement in Forging-Presses, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, in which Figure 1 is a side elevation, partly broken. away and partly in section, of a. forging press having our invention applied thereto. Fig. 2 is a section on the line 11 11 of Fig. 1. Fig. 3 is a detail view showing the table operating parts; Fig. 4 is a detail sectional view of one of the power cylinders. Fig. 5 is a. view similar to Fig. 1, but showing another form of the invention; and Fig. 6 is a diagram showing the connections for the table controlling cylinder. Fig. 7 is a diagram illustrating in dotted lines the original position of the piece before being operated on and in full lines the change in form and position of the piece due to the compression.

Our invention has more particular relation to the provision of tables for forging presses; and is designed to provide means of simple and convenient character by which a piece being forged may be carried forward and backward through the press for forging.

To accomplish this object we have provided means for permitting the table or tables to depress as the material being forged is reduced, and for raising the tables again as the forging anvils move apart so that the shoulder on the forging, caused by reduction, will pass over the bottom anvil and in between the anvils for the next reduction. Our invention also preferably provides means for controlling the elevation of the tables at eachside of the press relatively to each other and to the bottom anvil, so that the piece while being forged may be carried horizontally through the press regardless of its reduction or its direction of travel in forging.

tions.

The nature of our invention will be best understood by reference to the accompanylng drawings in which we have shown the preferred embodiment thereof, which will now be described, it being premised, however, that various changes may be made in the details of construction and arrangement of the parts by those skilled in the art, without departing from the spirit and scope of our invention, as defined in the appended claims.

In these drawings, the numeral 2 designates the bottom anvil of the press and 8 the top anvil.

4 and 5 designate tables at the two sides of the press, which may be of any suitable character, roller tables being shown.

6 designates the driving shafts and 7 the driving gears for the table rollers.

Each table is supported upon the substantially horizontal arms of bell cranks 8 and 9, these bell cranks being secured to transverse shafts 10 and .11, respectively, which are supported in suitable bearings underneath the table near the ends thereof. The two bell cranks 8 and 9 are set in reverse posi- The vertical arm of the bell crank'9 is connected by a rod 12 with an upwardly extending arm 18 which is secured to the shaft 10. Each bell crank 8 has its downwardly projecting lever arm 14L connected to a piston 15 working in a cylinder 16. The cylinder 16 is common to both pistons 15, the two pistons entering the cylinder from opposite ends through suitable stuffing boxes 17. It will be obvious, however, that if desired each piston may have its own cylinder. The central portion of the cylinder has a connection 18 leading direct to an accumulator having a liquid under constant pressure. Each of the shafts 10 also has a. downwardly projecting arm 19, these arms being respectively engaged with collars 20 and 21 on the piston rod 22 of a power cylinder 23. The piston 24 of this cylinder is a differential piston, the area of that side of the piston in the direction of the rod 22 being considerably less than the area of the opposite face of the piston. The cylinder 23 is connected by a pipe 25 to an accumulator or other source of constant pressure, this connection being made through a 3-way valve 26 of such construction that the water may be locked in the cylinder. The water enters the cylinder at the side of the piston having the larger area. The opposite end of the cylinder chamber has a pipe connection 27 leading direct to the accumulator.

During the forging operation a constant pressure from the accumulator is maintained in the cylinder 16, the tables being kept in their raised positions, this movement being limited by the arms 19 coming in contact with the collars 20 and 21. The collar 20 is preferably made adjustable, its adjustment being secured by the jam nuts 20 having hand wheels 20". At each stroke of the press, as the piece is reduced, the tables will depress, the pressure in the cylinder 16 beingovercome by the weight of the tables together with the pressure of the piece which is being forged. As the press head rises, the tables will return to their raised positions limited by the said collars. The table at the receiving side of the press must be higher than the delivery table to an extent substantially equal to half the amount of the reduction in order that the piece being forged may move horizontally through the press. By admitting pressure to the cylinder 23 through the pipe 25, owing to the differential area of the two piston faces, the accumulator pressure through the pipe 27 may be overcome, thereby permitting said piston and collars to move to the right (looking at Fig. 3), thelever 19 on the table 5 will be held against the collar 21 due to the pressure in the cylinder 16, while the lever 19 on the table 4 will be moved along by the collar 20, thereby displacing the liquid under pressure in the cylinder 16. The table 5 will therefore rise while the table 4 will fall. If pressure is cut off from the pipe 25 and the valve 26 is moved to exhaust position, the accumulator pressure will operatethe differential piston in the reverse direction, thereby raising the table 4 and effecting a corresponding lowering of the table 5. This change of elevation of tables 4 and 5 will occur as the direction of travel through the press of the piece being forged is changed in order that the end already reduced may be supported and thus keep the piece in a horizontal position. The 3-way valve 26 provides means whereby that end of the cylinder 23 may be conb nected with the accumulator pressure, or

with an exhaust connection at 26*, and also whereby the liquid may be locked in that end of the cylinder against the accumulator pressure at the opposite side of the piston.

If it is desired to change the difference of elevation of one table to the other with a given elevation of the lower table above the bottom anvil, this may be accomplished by lengthening or shortening the distance between the two collars 20 and 21. If the distance between the collars is lengthened by adjusting the nuts 20, the table 5 will be raised, the arm 19 being kept in contact with the collar 20 by constant pressure in the cylinder 16. Thus, if the table 5 is onehalf inch above the anvil, and the collar is adjusted until the table 5 is one inch above the anvil, the difference of elevation of the two tables will be changed one-half inch. If the piston rod 22 is now moved back until the table 5 is again one-half inch above the anvil, the table 4 will be one inch higher with relation to the table 5 than it was before.

In Figs. 5 and 6 we have shown another form of our invention, which for simplicity of construction and operation, is to be preferred to the form first described. In this modified form of our invention, the cylinder 23 is omitted. The cylinder 30, (corresponding to the cylinder 16) is provided with two pistons 31 and 32, corresponding to the pistons 15 and connected to the tables 4 and 5 in the same manner as the pistons 15, but having each two piston faces a and b. The central portion of the cylinder 30, between the two pistons, has a pipe connection 33 leading through a valve 34 to an accumulator containing a liquid under constant pressure. 35 and 36 designate the connections leading from the valve 34 to the accumulator. The end portions of the cylinder 30 are connected to the valve 34 by the connections 37 and 38. The pipe 37 is also connected to the accumulator through the 3- way valve 39.

During the forging operation, a constant pressure is maintained in the cylinder between the two pistons, the valves 34 and 39 being in position to lock the water in the end portions of the cylinder. At each stroke of the press, as the piece is reduced, the tables 4 and 5 will depress, thereby pushing the pistons inwardly toward each other against the accumulator pressure between the pistons, this pressure being overcome by the weight of the tables, together with the pressure on the piece being forged. This movement of the pistons creates a partial vacuum in the ends of the cylinders. As the press-head rises after each stroke, the tables will return to their raised positions, limited by the liquid locked in the ends of the cylinder. By moving the valve 34 to a position to admit pressure therethrough to the pipe 37 and to connect the pipe 38 with exhaust (see Fig. 6) the liquid is locked in the central portion of the cylinder, and the two pistons will move (to the right) as a unit, causing table 4 to be raised and the table 5 to lower. By reversing the position of the I liquid tcsenter between the pistons.

valve 34 to connect pipe 38 to the accumulator and pipe 37 with exhaust, the two pistons will be moved in the reverse direction, and table 4 will be lowered and table 5 raised.

To change the difference of elevation of the two tables, with a given elevation of the lower table with respect to the anvil, the distance between the pistons may be changed by the admission or release of water from between the pistons. To lengthen the distance between the pistons, liquid may be exhausted from the pipe 37 by means of the valve 39, valve 34 being set to allow more This causes the table 5 to rise. By operating valves 34:, the table can be lowered to the same elevation with respect to the anvil as before, the other table having a corresponding rise.

The advantages of our invention will be apparent to those skilled in the art, since it provides means of simple character by which tables may be used in connection with a forging press for moving the piece through the press, so that both end portions of the piece being forged can be supported by the tables notwithstanding the reductions effected by the forging operations, and which will depress with the piece while forging and return to up position when press head lifts.

WVhat we claim is 1. The combination with a forging press, of tables at opposite sides of the anvil of the press, power means connected to the tables and arranged to act to cause said tables to be normally held in a raised position, and also to effect their simultaneous raising or lowering, or the raising of one table and the lowering of the other one, and means to control said power means to limit the extent of elevation of the tables, and to vary the difference in elevation between the two tables without varying the extent of their movement; substantially as described.

2. The combination with a forging press, of tables at opposite sides of the press for moving a piece being forged through the press. a power cylinder having two pistons therein, one of said pistons being operatively connected with one of, the tables, means for admitting a constant pressure between the pistons, means for limiting the upward movement of the tables under the action of the pistons, and means for controlling the movement of the pistons whereby the movement of either table may be varied with respect to the movement of the other table; substantially as described.

3. The combination with a forging press, of tables located at opposite sides of the press and supported for raising and lowering movement, a power cylinder having two pistons therein, each piston being connected to one table to effect and permit raising or lowering thereof, means for admitting a substantially constant pressure to the cylinder between the pistons, and means for modifying and controlling the movement of said pistons to thereby change the movement of one table with respect to the other table; substantially as described.

4. The combination with a forging press, having tables supported for a raising and lowering movement, of power means for actuating said tables, said power means having controlling devices for varying the difference in elevation between the two tables without varying the extent of their up and down movement, substantially as described.

5. A forging press having tables at the two sides thereof, means for raising either table and simultaneously therewith causing a lowering of the other table, and means for adjustably limiting the upward movement of the tables; substantially as described.

6. A forging press having two movable tables supported to raise and lower, connected bell cranks upon which each table is su ported and power means for actuating the bell cranks to cause the simultaneous raising or lowering of the two tables or the raising of one table and the lowering of the other; substantially as described.

7. A forging press having two tables supported to rise and fall, a power cylinder, two pistons arranged in said cylinder, each piston being connected to one of the tables, means for admitting a constant pressure to the cylinder between the pistons, and other means for causing a movement of either piston in the cylinder to vary the position in which it is acted upon by such constant pressure; substantially as described.

8. A forging press having tables at opposite sides of its anvil, means for supporting and actuating the tables whereby one table may be caused to rise and the other one to simultaneously fall, and means for modifying the action of the actuating means for changing the distance bet-ween the planes of elevation of the two tables; substantially as described.

9. A forging press having tables at opposite sides of its anvil supported to rise and fall, a power cylinder, two double acting pistons in-said cylinder, each piston having an actuating connection with one of the tables, and valved fluid supply connect-ions leading to the intermediate and end portions of the cylinder; substantially as described.

10. A forging press, having a table at each side of its anvil, the tables being supported for a rising and falling movement, a power cylinder, two double acting pistons in said cylinder, each piston being connected to one of the tables, a fluid pressure pipe locked in varying volumes either between 5 FRANK I. ELLIS.

EDWIN J. MQILVRIED.

communicating with each end of the veylinder and also With the intermediate portion, and valve means whereby the fluid may be the pistons .or in either end of the cylinder; substantially as described.

11. A forging press having two tables supported to rise and fall, a power cylinder, and means for controlling the action of said cylinder whereby one table may be caused Witnesses:

ALICE A. TRILL, F. C. BIGGER, Jr.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

- Washington, D. 0. 

